Human Risk Induced Behavioral Shifts in Refuge Use by Elk in an Agricultural Matrix

• Published in: Wildlife Society bulletin 2017-03, Vol.41 (1), p.162-169
• Main Authors: Visscher, Darcy R., Macleod, Ian, Vujnovic, Ksenija, Vujnovic, Dragomir, Dewitt, Philip D.
• Format: Article
• Language: English
• Subjects: behavior; camera trapping; From the Field; human disturbance; hunting; non‐consumptive effects; refuge; risk allocation hypothesis; temporal shift
• ISSN: 1938-5463; 2328-5540; 1938-5463
• DOI: 10.1002/wsb.741

Scientists increasingly acknowledge the influence that nonlethal effects of predation have on structuring wildlife-landscape interactions. In landscapes dominated by human activities, wildlife can respond to human disturbance in a similar fashion to the risk of predation. Further, the risk allocation hypothesis suggests that individuals respond most strongly to risk when it is spatially and temporally predictable. We predict that individuals in agriculturally dominated landscapes will respond to potential risk from humans during hunting season by shifting their behavior to avoid agricultural areas during the day, instead retreating to refuge habitat. We predict that this shift tomore nocturnal behavior will be strongest for elk (Cervus elaphus) adult female–calf pairs and will be influenced by the level of moon illumination. Using motion-sensing cameras, we studied the response of elk moving between the Wainwright Dunes Ecological Reserve (a hunting refuge) and surrounding agriculturally dominated landscape in east-central Alberta, Canada, to human disturbance in relation to sunrise and sunset. Elk became increasingly nocturnal with the onset of hunting, leaving the refuge following sunset and returning to the refuge earlier before sunrise. Further, elk became increasingly nocturnal in response to greater levels of moon illumination. Lastly, we found that adult female–calf pairs perceived greater risks associated with diurnal activity and exhibited the most nocturnal behavior relative to other demographic classes. Our results suggest that ungulate management based on traditional hunting seasons and times may be problematic as it creates strong cues for resident elk, allowing them to minimize risk by avoiding risky places at risky times in accordance with the risk allocation hypothesis.